Steam-generator.



No.' 73s,526. PATENTED SEPT. s, 1903 G. 1). 000mm. STEAM GENERATOR.

APPLICATION FILED JULY 1, 1902.

N0 MODEL.

M91160) Ce/ r- 17. Cooper Tngmonm: was comuonmuww WASNINGTON. n. c.

GEORGE DORELL COOPER, OF ST. JOHNS,

lPatented September 8, 1963.

PA TENT OFFICE.

MICHIGAN, ASSIGNOR OF ONE.

HALF TO SEYMOUR D. WATSON, OF ST. JOHNS, MICHIGAN.

STEAM-GENERATOR.

SPECIFICATION forming part of Letters Patent N 0. 738,526, dated September 8, 1903. Application filed July 1, 1902. Serial No. 113,959. (No model.)

To all whont it may concern:

Be it known that I, GEORGE DORELL COOPER, a citizen of the United States, resida vertical water-wall D, the

ing at St. Johns, in the county of Clinton and State of Michigan, have invented certain new and useful Improvements in Steam-Generators, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention has particular reference to a water-tube boiler, and it consists in the novel construction thereof and in the peculiar arrangement and combination of its various parts, as will be more fully hereinafter described,and shown in the drawings,in which- Figure 1 is an elevation of the boiler. Fig. 2 is a vertical central longitudinal section therethrough, and Fig. 3 is a vertical cross section.

Briefly described, the reference-letter A designates the steam-drum of the generator, which is preferably cylindrical in configuration and of any approved construction.

B is the usual dry-pipe therein, apertured upon its top, as shown, and having an exit 0, leading to and through the boiler-top.

As illustrated, the drum is supported upon wall being of greater width than the diameter of the drum and supported in turn by a framework E upon each side of the drum and supporting feet or brackets F. As shown, the water-wall is recessed or arched at its lower portion, forming two vertically-depending spaced water-legs G and H, extending in proximity to the base of the framework.

. I designates a plurality of water-tubes projecting from the opposite sides of the waterwall and also from the two water-legs, as shown. These tubes are closed at their outer ends by plugs 01,, which are fitted tightly within the pipe ends and are squared. The opposite or inner ends of the tubes are threaded and adapted to be screwed within openings formed within the water wall and legs, as shown in the drawings. For the purpose of allowing the Water to drain from the pipes into the water-wall and the water-legs communicating therewith the groups of pipes upon the opposite sides of the wall and legs are inclined slightly vertically. The waterwall in turn communicates at its upper end with the steam-drum, so as to permit of a circulation through the drum, the water-wall and depending legs, and the pipes or tubes.

By arching the water-wall and arranging the Water-tubes therein in the manner set forth it will be observed that a firechamber J is formed by the tubes which extends uninterruptedly beneath the drum its entire length. Thus a maximum amount ofheating-surface is produced for the boiler and the efficiencyof the apparatus is materially increased.

K represents the ordinary grate-bars arranged in the fire-chamber, and L designates the main steam-pipe connected to the drypipe previously referred to and preferably coiled about the drum in close proximity thereto, as illustrated.

M designates an outer metallic casing which incloses the entire apparatus with the exception of the brackets and framework E, and O is a smoke-pipe leading from the casing through which the products of combustion pass.

The casing described forms a combustionchamber'about the water-tubes,the drum,and the coil portion of the main steam-pipe, so

that the steam is superheated and becomes dry, whereby a large amount of water that in other generators is usually carried off by the steam is retained in the boiler. The water-tubes are secured within the Water-wall and the depending legs in a manner to leave spaces therebetween for the circulation of the flame and the gases of combustion, the latter passing upwardly between the tubes and also within the combustion-chamber about the tubes to the stack. The free end of the main steam-pipe projects through an opening I) in the front of the casing M, permitting proper connections to be made between it and the engine.

For the purpose of cleaning the generator valve-controlled blow-off pipes A are employed, leading from the bottom of each water-leg. These pipes are preferably four in number, extending from the opposite sides of the legs in a manner similar to the watertubes and projecting through the casing ends, the valves B, as shown, being without the easing where access may be readily had thereto communicating with the drum, said wall hav- When it is desired to clean the apparatus. ing its lower portion arched forming two What I claim as my invention is spaced water-legs, a plurality of parallelly- 1. In a steam-generator, the combination arranged water-tubes projecting from the op- 5 with the steam-drum, of a vertical water-wall posite sides of the water wall and legs forming 25 beneath and communicating with the drum, a fire-chamber extending unin terruptedly bethe wall havingits lower portion arched formneath the drum its entire length, said tubes ing two spaced water-legs, a plurality of wabeing closed at their outer ends and commuter-tubes projecting in the direction of the nicating at their inner ends with the arched 1o drum from the opposite sides of the water water-wall, and an outer sheet-metal casing, 30 wall and legs forming a fire-chamber extendprovided with a stack, inclosing and forming ing uninterruptedly beneath the drum its ena combustion-chamber about the tubes, watire length, said tubes being closed at their ter-wall and drum. outer ends and communicating at their inner In testimony whereof I affiX my signature I5 ends with the water-Wall, and a casing inclosin presence of two witnesses.

ing andforming acombustion-chamber about GEORGE DORELI COOPER the tubes, water-wall and drum.

2. In a steam-generator, the combination Witnesses: with the horizontal steam-drum, of a Vertical WILL. H. BRUNSON, 2o water-wall forming a central support for and ALFRED D. MILLER. 

